Speed limits are generally too low.. this is the problem.

Or roads are badly designed, in a way that their psychological speed limit is higher than what is indicated. But the lower limit can have more reasons, such as noise pollution near a residential area, or pedestrian safety.

Speed limits are defined on population density, to get a wavier for a well designed road just isn’t worth the cost.

There are a lot of dumb laws, including speed limits, that need someone other than a lawyer to opine on. Unfortunately it has all become a spectacle.